Variable-speed rolling-mill drive



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' H. H. TALBOT VARIABLE SPEED ROLLING MILL DRIVE? Filed June 21-. 1921 JNVENTO A BEST AVAiLABLE com Patented Nov. 4, 1924.

UNITED STATES PATE FFER nowazab HQ ramao'r, or'woos'rm onrofassronoa BY-Mssm: assremmiirsfiro imcxm'rosK-rmurnmr. .comramr, or PITTSBURGH, PENNSYLVANIA, A con roaa'rrou or rnmrsnvama.

VARIABLE-SYEED ROLLING-MILL DRIVE.

Application filed-June 21, 1921. Serial No. 479,212.

To. all whom it may concern:

Be; it known that L Howann. H. Tanner,

' a citizen of the United States, residin at Wooster, in the county of Wayne and ofuthe mill from a single line shaft through bevel or other gearing, connecting the line shaft with the individual roll shafts throughout. Because of the necessary suecessively increased speed of the several stands from the first to thelast pass, thevariations between'the gear ratios was necessarilyiexcessive, and involved the use of extremely large and extremely small gears,

as to their pitch diameter, together with the necessary space, spacin of the rolls, vari-' able and excessive friction, and other objectionable features.

In my resent 3 a prime'mover through the agency of two independent drive or line shafts, geared with the motor for different speeds, and connecting the several rolls of the entire number of stands therewith in two independent series lthrough-correiponding series of pairs of bevel gears. Th .e are suitably proportioned to transmit the desired speeds, and

' within'entirely practicable limitations as to pitch"di ameter, with the resulting advan- 0 ages,ashereinafte r more fully described.

The invention is illustrated in the-accompanyingdrawing in which Fig. 1. shows in diagrammatic plan view theiseveral rolls ofa continuous mill and the power and driving mechanism therefor.

"The power equipment of the mill utilizes two main driving shafts 2 and 3' res ectively of relatively low and high spee shaft 3 being connected with the driving motor 4: 5O

Sine 5 of-, Ohio, have invented certain new and useful Improvements in Variable'Speed Roll- Drives, of which the following a continuous rolling. mill" correqiondinglv greater than that of shaft through its gear wheel-5 and pinion 6 of.

shaft '1 connected directly with the motor,

and arranged, to transmit power tothe finishing train of rolls through the intergosedfhaft bevel gearing, at accelerating s 2 is geared with the motor sha gear 8 and motor pinion -9., a qhaft 52 transmits power to the primary train of rollsthrough'the interposed bevel' eeds.

through its v gearing, at acce'leratin lower s eeds, as ,will

be readily understood y those amiliar with the'artl Thus, shaft 2 is geared through pairs of bevels a, a; b, b';a,'c'; and'd, d) with the. several drive.'shafts 11 ,12, '0' and rlofstands of rolls a, b a? and d of the mill.. 1 In a similar manner, shaft 3, of hi her speed,transmits power to. the v secon 'ary finishing trainof rolls through theinterposed ihevel gearing at accelerating higherv speeds. shaft 3 Iis geared through pairs of bevels e, e; f, f';'g, g and h, h';"

with the several drive shafts e, f, g and h of stands ofrollse, f audit of the mill.

Shaft 2 is preferably provided with a thrust bea-ring'A'and shaft 3jwith a thrust V i Y hearing l? of suitable construction near the invention I overcome these various 0 ect1ons by utilizing the power of ment, shaft 2- is in tension relation to thrust bearing A and shaft; 3 is in icompression relation to thrust bearing B, and theyoperate independently in each, ease-,to maintain their shafjisand the; jiarsithereof in continuous operative relation to the gears of the several roll a 'alft I Referring to the p 'r transmission from motor 4 to shafts 3 and 2, it willhe'observed that the ratio of reduction fromffiptor shaft '7 to shaft 3 through gears 6-5 ;is lower than through gears 9-8 to shaft;2.- The rel ative driving speed of shaft 3 is therefore 2, and approximates the Sarge 1nereaSed ratio as prevails between the av itrage speed of the series of rolls e, f, g, hi and that The stepped up pitch diameterof each 1 .pinions with set of driving bevel pinions of each shaft and 3, and-of their companion drivenbevel pinions, for each series, are thereby cagable shafts by selection 0 the proper ratios of their intervening gearing, so as to permit the use of driving and'driven bevels haying the characteristics noted. There is,

therefore, present, in effect, a two-part drive equipment for .the first and second series of rolls, each deriving its power from the same initial source.

-The advantages resulting from this an rangement are several and important. It allows for the use of gears of a more uniform size and with better operating conditions as to hearing pressure; and pitch line velocity than has-heretofore been possible with the commonly used, single driving shaft. Because of the arbitrarily selccte speeds ofthe driving shafts 2 and 3, the ratios between the driven gears and drivin pinions foi each mill are materially reduce thereby correspondingly reducing the dis-,

tance between the roll centers of the several stands; shortening the length of the mill and mak ing it more compact than would otherwise be possible, both as to the construction of the intervening guides and the decreased'loss of heat in the metal'i'n passing from one stand to another.

Due to the reduced variation between the diameters of, the several pairs of gears, and the avoidance of excessively large or small gears, they are easily capable of being completely enclosed, providing absolute protection to the workman and facilitatingample lubrication. The use of excessively small relatively very large gears, resulting in excessive wear in the teeth of the pinion, is entirely avoided, with the'consequent economy and better service. These advantages will be appreciated by all those familiar with rolling mill practice. In a typical mill such as that shown, the speed of the motor shaft is 360 R. P. M. of shaft 2, .45 R.. P. M.; and of shaft-3, 120 R. P. M. Thefirst standdf rolls a is driven at a speed of 17 R. P. M. and the last stand it at 217R. P. M., and the intermediate stands at uniformly increasing intermediate speeds, as-for instance. 2% R. P. M., c 37 R. M. M., d 51 B. P. M., c 81 R. P. M., f 116 R. P. M., and g 159 R. P. M. Such ratios may, of course, be changed or varied to suit the several reductions desired, de-

This is of distinct advantage in BEST AVAILABLE co er pendent on the design of the rolls or other conditions present.

The number. of stands and their sets of gears may lso be increased or decreased, or other changes or variations may be made from the specific construction shown and described by the designing engineer or builder to adapt the-invention to different conditions or uses, but all sucliare to be understood as within the scope ofthe followin" claims. W

What I claim is:

1. The combination with a -.continuous rollingmill utilizing successively operating rolls in two independent seriesyiof a separate .drive shaft geared with each series through corresponding series of gear reductions of different ratios, anda prime mover in driving connection with each'drive shaft.

2. In a continuous mill for reducingmetal, the combination with a prime mover, and .two independent line shafts geared therewith, of successively reducin "independent series of rolls geared wit each I shaft through. gear reductions of different ratios.

.3. In a continuous mill for reducing metal, the combination with a prime mover, and two independent line shafts geared therewith for: variable speeds, of successively reducing independent series of rolls geared with each shaft through gear reductions of diiferent ratios.

4;. In a continuous mill for reducing metal, the-combination with a prime mover, and two independent line shafts geared therewith for variable speeds, of a continuous successively operating series of primary rolls and'pairs of gears of diifercnt ratios ope'ratively connecting them with one line shaft, and a continuous successively operat- ;ing series of secondary rolls and pairs of gears of diiferent ratios operatively connect-' ing them with the other line shaft.

5.'-In; combination, a continuous rolling millcomprising a continuous a secondary series of rolls, shafts therefor, a primary and a secondary drive shaft,

seriesY-jbf pairs of gears of different ratios connecting the shafts of the primary roll Series'iyvith the primary drive shaft, series of pairs of gears of different ratios connecting the shafts of the secondary series with the secondary drive shaft. and a prime mover geared wi'thboth drive shafts.

6.. In combination, a continuous rolling mill comprising a continuous primary and a secondary series of rolls, shafts therefor. a primary and a secondary drive shaft of different speeds, series of pairs of gears of different ratios connecting the shafts of the primary roll series with the primary drive shaft, series of pairs of gears of different ratios connecting the shafts of the secondary series with the secondary 'drive shaft, and a primary and prime mover geared with both drive shafts.

7. In combination, a continuous rolling mill comprising. continuous primary and a secondary seriesof rolls, shafts therefor, a primary line shaft, a secondary line shaft of increased speed, a prime mover .geared with the line shafts for driving the same at' lower and higher speeds respectively, and gearing of different ratios connecting the shafts of the primary and secondary series 10 HOWARD H. TALBOT.

' BEST AVAILABLE COPY 

